The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

World's largest collection of serial killer artwork and other macabre exhibits.

Opened as part of the New Deal, the training facility now features World War II-era structures and a pylon that once stood at the World Trade Center.

This colorful gate stands as an entrance to the walled city of Old San Juan.

Archaeological sites and great food inside the island's largest mangrove forest.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

A park where people have been going to feed friendly pigeons since the 18th century

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This tiny home was originally a narrow alleyway.

The rounded structure has evolves from service station to citrus to souvenirs to Charley survivor.

Measuring approximately 200 feet long, Swampy is the world's largest alligator-shaped building.

An interactive, open-air museum reveals Central Florida's storied past.

The whole world is cooking in one Kissimmee parking lot.

A bizarre house filled with an astounding array of collections.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

"Looks so real, it's scary!"

The arboretum whose marshy soil sucked up the dreams of housing developers.

Comprised of Spanish war cannons, this sculpture once graced the bow of a WWI warship.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The last remaining vestige of a popular 1999 public art display.

Louis Sullivan’s dark, swirling cast-iron designs envelop a popular department store in this Chicago landmark.

This historic hotel invented the chocolate brownie.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

One woman's Viking Castle on Lake Tahoe.